I like Valvoline Maxlife. Works well in my truck as Dextron VI. It isn't as good in my Mustang though. I think its too thin. I just changed it out to Ford Mercon V and the transmission shifts so much nicer.
Mine is all over the place. Depends if AC is on or off. Highway driving vs city stop and go.
4L60E is decent transmission. You just have to service them often. 260,000 kms on mine and still shifts great.
Yes. It has been since around 60,000 kms. Its pretty faint but you can hear it in a drive thru. My o ring was pretty hard. I think it helped a bit. I had to change the oil pan gasket so I changed that o ring while the pan was off. The bottom of my oil pan was very clean. Like I said, I don't...
Like I aid, sea foam. I've owned my 4.8 since new. I've changed the o ring. Always ran synthetic. Sea foam once a year gets rid of most noises. 250,000+ kms on it now. Hasn't blown up yet. Still uses no oil in between oil changes. I think LS engines make noise if any "gunk" is on the rings or...